unordered_map长度

unordered_map的长度是指其中元素的数量，可以通过unordered_map的size()函数来获取。例如，对于一个名为exampleMap的unordered_map对象，可以使用exampleMap.size()来获取其长度。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
#### 引用[.reference_title]
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